I can confirm this is working on the Fire HD 8 . Here is the article from XDA with detailed instructions for newbies. Like all other hacks or tricks, I cannot be held responsible for any possible permanent damage you may cause to your devices.
A factory rest will restore all SYSTEM/Amazon apps you 'uninstalled.' So if you mess your tablet, you can at least start over.
1) If you plan on installing 3rd party apps to replace the Amazon apps you uninstalled, please install and setup your 3rd party apps BEFORE uninstalling Amazon apps. In many cases, installing replacement apps after the uninstalling of Amazon apps, causes some 3rd party apps to malfunction. You will then have to uninstall the 3rd party app or do a reset. Once you uninstall an Amazon app, you CANNOT install it again. Not even from the Google Play Store. The only way to restore any uninstalled system apps is to do a factory reset.
2) Uninstalling Fire Launcher, Retail Demo, and the Oobe settings apps, *WILL* disable your home button. If you uninstall any parental controls, your camera picture roll will not work. Recommend installing replacement camera and gallery before uninstalling Amazon's. As of July 27, 2017 9:20am a *pre uninstall* fix exists to make sure your home button stays functional. If you already uninstalled the apps listed in the following link, you will have to perform a reset and download the tool linked just below, or if you prefer manually uninstalling the apps, *avoid uninstalling*: com.amazon.kor.demo, com.amazon.firelauncher and com.amazon.kindle.otter.oobe. You can also edit the tool's .bat to keep the apps you want. This link lists all the apps you can uninstall, that will NOT affect the home button. The three listed at the top should NOT be uninstalled.
** Gloating **
1) A tool has been created that allows this process to happen automatically. A huge thanks to 'savvytechwinner' for helping for months to get us to this stage and an even bigger thanks for creating the tool, something I have no idea how to do.
2) A little gloating: We've scored a great write up on Liliputing!
You can use an app like App Inspector to view the package name of each app, rather than list all of them in a shell window. Nonetheless, I kept the list command in the code.
Here you go:
adb shell $ pm list packages $ pm uninstall -k --user 0 <name of package>
adb shell $ pm list packages $ pm uninstall -k --user 0 com.amazon.avod Success